76 UNIVERSITY OF COLORADO STUDIES 



Order PEZIZALES 



Family ASCOBOLACEAE 

 Ascobolus xylophilus Seaver, Mycologia, III, March, p. 61. T. 1. Geneva Creek Canyon, 

 Colo., on coniferous wood, Sept., ioio (Seaver and Bethel). It is the only North 

 American species on wood; most occur on dung. A. immersus Pers. and A. sterco- 

 rarius (Bull.) were found on cow-dung from Geneva Creek Canyon. 



Family CENANGIACEAE 



Godronia betheli Seaver, Mycologia, III, March, p. 64. T. 1. Tolland, on branches of 

 Salix, Aug., 1910 (Seaver and Bethel). Seaver in Mycologia, IV (1912), p. 123, 

 states that this is apparently identical with G. striata (Ell. and Ev.) Seaver. 



Order SPHAEROPSIDALES 



Family SPHAEROPSIDACEAE 



Septoria samarae Peck, New York State Museum Bulletin, CL (Botanist's Report for 



1910), p. 63. Dated May 15, 1911, but was not sent out until Aug. 20 (Peck in litt.). 



T. 1. Morrison (E. Bartholomew); also at Golden (E. Bethel). Mr. Bethel tells me 



that it is common at Boulder. It occurs in samarae of Acer negundo and A . glabrum. 



Order UREDINALES 



Family AECIDIACEAE 



Uromyces aemulus Arthur, Bull. Torr. Bot. Club, Aug., p. 373. T. 1. Yellowstone Park, 



on Allium brevistylum; also at Hot Sulphur Springs, Colo., July 24, 1907 (E. Bethel). 

 U. mysticus Arthur, t. c, p. 377. T. 1. Denver, on Hordeum jubalum, Oct. 29, 1910 



(E. Bethel). Mr. Bethel tells me that the type was from Washington Park. 

 Puccinia pagana Arthur, t. c, p. 372. T. 1. Dead Lake, Pike's Peak, on Allium reticula- 



tum, Aug. 20, 1904 (F. E. and E. S. Clements). 

 Gymnosporangium juvenescens Kern, Bull. N.Y. Bot. Garden, VII (Oct.), p. 448. 



T. 1. Boulder, on Sabina scopulorum, April 27, 1907 (Arthur, Bethel and Kern). 



Mr. Bethel says the type came from Skunk Canyon. The aecia are on Amelanchier. 



This is the species formerly confused with G. nelsoni. 

 G. kernianum Bethel, Mycologia, III, May, p. 157. T. 1. Paonia, on Sabina utahensis 



(Bethel). Also at Glenwood Springs (Bethel). 



Phylum SPERMATOPHYTA 



Class ANGIO SPERM AE 

 Subclass DICOTYLEDONES 



Family SALICACEAE 

 Populus aurea Ivar Tidestrom, Amer. Midland Naturalist, II, March, p. 35. T. I. 

 vicinity of Mount Carbon, May 29, 1910. Also from Horse Fly Mountain, Uncom- 

 pahgre Plateau, Colo., and in Utah. The Colorado material was collected by Tide- 

 strom. This is said to differ from P. tremuloides by the shorter and less dense 



